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Cats and grains
http://www.felinefuture.com/nutrition/grains.php
Grains have been a major mainstay for humans, and the agriculture as well as use of grain in our diet, providing us with bread - a dense source of energy and nutrients - have propelled human civilization forward in its evolution. But what about grains in the meal plan of the cat? Cats are domesticated animals, heavily influenced by human society. They share our lives, our house, and - yes - our food. Nonetheless, the cat is a cat. In a very distant past we may indeed share a common ancestor as mammals, but otherwise the cat's physiology is as much an extreme when compared to ours, as day is to night. If we want to understand the dietary needs of cats, we must look at cats as they live in the wild, and not at how they live as part of human civilization, and thusly the foods they adapted to eat. Grain is man made - grass seeds, enhanced in size through selective breeding. Before humans discontinued their nomadic lifestyle and settled as farmers, there was no grain. There where only seeds - available to wildlife for the take merely seasonal. Advocates of the use of grain in cat foods argue, that these foods would naturally be part of the cat's diet as the stomach content of their prey - rodents and birds. Yet, these species too, where first introduced to grain merely ten thousand years ago, and that only in the presence of far apart human settlements. A truly natural diet for rodents and birds is not based on grains, but on insects and fruits, as well as greens for rodents. Merely seasonal do these animals fed on seeds, and a large proportion of those would be made up of oily seeds and nuts, rather then carbohydrate based grass seeds. The relation of the stomach content, for example of a mouse, is only 5% - 9% of the total weight of the animal, therefore not supplying the cat, at any time, with more then that as grain in her diet. Now, at the dawn of mankind, grain was not a natural food for humans either, but we have perfectly adapted to it as a mainstay. Could the cat adapt? Yes and no. Simple differences between people as omnivores and cats as true carnivores make it impossible for the cat to break down nearly any type of plant matter. Digestion of carbohydrate and cellulose containing plant matter begins in the mouth. The substances are ground up by our chewing motion and fortified with enzymes, in order to break them down manually as well as chemically. The cat, in turn, possesses no molars, nor the ability to chew or grind foods. Also, the cat's body does not produce the enzymes necessary for the break down of plant cellulose. The cat's digestive tract is, in relation to that of a human, much shorter and designed to deal with highly digestible foods of animal source; any ingested plant matter is normally passed "unharmed". The cat's digestive juices may be potent, but it is digestion time that breaks down plant matter. The cat passes food much too quickly from stomach to the small intestine and then to the colon, for any digestion of plant matter to happen. The cat is a very intelligent being, and she has emotionally adapted to a live among humans. Despite her extreme physical restrictions as true carnivore, the cat has learned to eat other, more human like foods besides her usual all prey regiment. In fact, this widened palate enables cats to live in colonies with their own kind - something never observed among their ancestors: the African Wild Cat. Because the domestic cat has adapted to eat other things, such as fatty or protein based human discards, and is not solely dependant on prey availability, territorial stress is greatly reduced - opening channels for communication. The adaptation to a greater variety of food sources did not leave the cat's physiology completely unchanged. In the cats native North African range, the now wide spread domesticated cat is a threat to the existence of her wild cat ancestor. Domestic stock frequently hybridizes with wild cats, leading to a rapit vanishing of pure wild cats. Scientists hope to preserve the species through population control of the domestic stock, but how does one distinguish between these two very similar looking species in order to catalogue any data or observations? As it turns out, the domestic cat's intestines are a few centimeters longer then those of a true wild cat, a feature which is passed on to hybrid offspring, clearly distinguishing true wild cats from those influenced by human civilisation. If the cat lacks the ability to digest plant matter, could grains be cooked as a means of "pre digesting" them? Yes, that does work indeed. The cat's food can thusly be fortified with carbohydrates which is converted by the cat's liver to glucose as a source of energy. The problem is, that the cat converts a large portion of dietary protein (glycogenic amino acids) to glucose for energy, and any excess of glucose from carbohydrate source is stored as body fat! The question should not be: if or if not the cat can digest grains, but rather if there is any benefit for the cat, or if in fact, it could be harmful. Commercial pet food manufactures rely heavily on the use of grains to manufacture their products. However, the grains are not added because they hold much nutritional value, but because they lower the cost of the product. The Cornell Book of Cats: "Although carbohydrates make up about 40% of commercial dry cat foods, they are not a dietary necessity for the cat. In fact, cats can be maintained on carbohydrate free diets in which energy is derived exclusively from non carbohydrate sources. Carbohydrates are included as a source of energy and to provide structure for dry cat food." The Merk Veterinary Manual: "Carbohydrates are a less expensive source of energy than fat or protein.(...) In cats, carbohydrates are apparently not essential in the diet when ample protein and fats supply glycogenic amino acids and glycerol.(...) In both dogs and cats, if starches are not cooked, they will be poorly digested and may result in flatulence or diarrhoea." The Well Cat Book: "Carbohydrates (sugars, starches, and cellulose) are not required by cats in their diet. The digestible carbohydrates (sugar and starch), however, can be used as energy source, providing 3.5 calories for each gram consumed. Cooking and/or fine grinding of carbohydrate sources (e.g. cereal grains, potatoes, vegetables) greatly improves their utilization and allows pet food manufacturers to formulate dry and semimoist foods based on these plant products that are not a major part of any cat's natural diet." Carbohydrates are not necessary in the cat's diet. If large amounts of grains are included in the diet, more essential nutrients are displaced by this cheap source of unnecessary calories. Intake of carbohydrates is the number one cause of obesity in cats. It causes indigestion, regurgitation, or diarrhoea, and Feline Future has traced grains and vegetables in cat foods as an overlooked cause of self induced bilateral alopecia (hair loss) in cats. Large amounts of sugars (and any amount of sugar is above the norm for cats) causes the endorcine system to overwork and malfunction, predisposing cats to the risk of pancreatitis and diabetes. (END |
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